11-06-2014
I would not worry about real memory being shown as used. The OS will retains data (including code) that have been used in case another process wants them as it is more efficient that reading from disk again. Memory is overwritten when there is a request for some and none is available. Either the oldest referenced section is overwritten or if it is still valid (i.e. owned by a process) it will be copied to the swap area and then overwritten. Consequently, memory appears full pretty much all the time.
Can you tell us:-
- How much real memory you have
- How much paging or swap space you have
- How much paging or swap is currently in use. The command swapinfo -a is useful here. Read the manual page for information about the output.
- How busy is your swap, i.e. is it being written/read back from a lot. The command vmstat 5 will give you this. Look at columns pi & po for the values.
If we see something horrible, then maybe it's time to try tuning, but let's not panic yet.
Regards,
Robin
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LEARN ABOUT OSX
dynamic_pager
dynamic_pager(8) BSD System Manager's Manual dynamic_pager(8)
NAME
dynamic_pager -- external storage manager for dynamic pager
SYNOPSIS
dynamic_pager [-F filename] [-S filesize] [-H high-water-trigger] [-L low-water-trigger] [-P priority]
DESCRIPTION
The dynamic_pager daemon manages a pool of external swap files which the kernel uses to support demand paging. This pool is expanded with
new swap files as load on the system increases. It is contracted when the swapping resources are no longer needed. The dynamic_pager daemon
also provides a notification service for those applications which wish to receive notices when the external paging pool expands or contracts.
OPTIONS
-F The base name of the filename to use for the external paging files. By default this is /private/var/vm/swapfile.
-H If there are less than high-water-trigger bytes free in the external paging files, the kernel will signal dynamic_pager to add a new
external paging file.
-L If there are more than low-water-trigger bytes free in the external paging files, the kernel will coalese in-use pages and signal
dynamic_pager to discard an external paging file. Low-water-trigger must be greater than high-water-trigger + filesize.
-P This option is currently unimplemented.
-S The fixed filesize [in bytes] to use for the paging files. By default dynamic_pager uses variable sized paging files, using larger
sized files as paging demands increase. The -S, -H and -L options disable that default and cause dynamic_pager to use a series of
fixed sized external paging files.
FILES
/private/var/vm/swapfile* Default external paging files.
/Library/Preferences/com.apple.virtualMemory.plist Configuration file.
XML PROPERTY LIST KEYS
The following keys can be specified in the configuration file. Please see plist(5) for more information about property list files.
UseEncryptedSwap <boolean>
This optional key activates encrypted swap (aka Secure VM), so that all data is encrypted before being written to a swap file. The default
is on for portable computers and off for other computers.
Mac OS X July 8, 2003 Mac OS X